Add background dimming view

SheetImagePicker/SheetContainerViewController.swift

@@ -31,13 +31,15 @@ public class SheetContainerViewController: UIViewController {
     var topDetent: (detent: Detent, offset: CGFloat) {
         return detents.map { ($0, $0.offset(in: view)) }.min(by: { $0.1 < $1.1 })!
     }
+    
+    public var minimumDetentJumpVelocity: CGFloat = 500
+    public var maximumStretchDistance: CGFloat = 15
 
     var topConstraint: NSLayoutConstraint!
     lazy var initialConstant: CGFloat = view.bounds.height / 2
     
-    public var minimumDetentJumpVelocity: CGFloat = 500
-    public var maximumStretchDistance: CGFloat = 15
-    
+    var dimmingView: UIView!
+
     public init(content: UIViewController) {
         self.content = content
         
@@ -51,6 +53,18 @@ public class SheetContainerViewController: UIViewController {
     override public func viewDidLoad() {
         super.viewDidLoad()
         
+        dimmingView = UIView()
+        dimmingView.translatesAutoresizingMaskIntoConstraints = false
+        dimmingView.backgroundColor = .systemGray
+        dimmingView.alpha = 0.5
+        view.addSubview(dimmingView)
+        NSLayoutConstraint.activate([
+            dimmingView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            dimmingView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            dimmingView.topAnchor.constraint(equalTo: view.topAnchor),
+            dimmingView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
+        ])
+        
         addChild(content)
         content.didMove(toParent: self)
         view.addSubview(content.view)

SheetImagePickerTest/ViewController.swift

@@ -14,6 +14,7 @@ class ViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view.
+        view.backgroundColor = .green
         
         let content = UIViewController()
         content.view.translatesAutoresizingMaskIntoConstraints = false
@@ -21,7 +22,7 @@ class ViewController: UIViewController {
         let sheet = SheetContainerViewController(content: content)
         sheet.delegate = self
         sheet.detents = [.bottom, .middle, .top]
-        sheet.view.backgroundColor = .blue
+//        sheet.view.backgroundColor = .blue
         
         addChild(sheet)
         sheet.didMove(toParent: self)